<template>
  <div class="list" ref="wrapper">
    <div>
      <!--当前城市-->
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <!--热门城市-->
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item in hot"
               :key="item.id"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <!--以字母开头的排序的城市-->
      <div class="area"
           v-for="(item,key) in cities"
           :key="key" :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="innerItem in item"
               :key="innerItem.id"
               @click="handleCityClick(innerItem.name)"
          >{{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import Bscroll from 'better-scroll'
  import {mapState, mapMutations} from 'vuex'

  export default {
    name: 'CityList',
    props: {
      cities: Object,
      hot: Array,
      letter: String
    },
    computed: {
      // mapState 是将vuex中的公共数据引入到当前组件的计算属性中
      ...mapState({
        currentCity: 'city'
      })
    },
    data() {
      return {}
    },
    methods: {
      handleCityClick(city) {
        // 点击热门城市，要在$store里面dispatch一个事件，同时将城市数据传过去
        // this.$store.commit('changeCity', city);
        this.changeCity(city)
        this.$router.push('/')
      },
      ...mapMutations(['changeCity'])
  },
  mounted()
  {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
  ,
  watch: {
    // 监听letter 的变化
    letter()
    {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // console.log(element);
        // 滚动到某一个元素上(传入的dom元素或者选择器)
        this.scroll.scrollToElement(element)
      }
    }
  }
  }
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc

  .border-bottom
    &:before
      border-color: #ccc

  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    text-align: left
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
